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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

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Post  Cox International Tue Mar 20, 2018 4:23 pm

We have a buyer who wrote that the hole in our TD 020 drive-plates is too big for the spline on his crank.

We have sold many of these parts and just tested ten of them on two different cranks; they fit tight.

Was there a time where Cox made TD 020 cranks with smaller splines?
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Post  Jason_WI Tue Mar 20, 2018 4:46 pm

Yes, the early TD .020 engines used a smaller spline. I have a TD .020 crank with the small crank spline. I have been looking for a small drive plate for a while now.
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Post  Cox International Tue Mar 20, 2018 4:50 pm

Jason_WI wrote:Yes, the early TD .020 engines used a smaller spline. I have a TD .020 crank with the small crank spline. I have been looking for a small drive plate for a while now.

Thanks and we have a few of the Space Bug Jr. ones here that may fit.

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Post  getback Wed Mar 21, 2018 8:34 am

Thanks Jason and Bernie , i am the customer and had forgotten that you had mentioned this a while back , sorry for the inconvenience .. Jason could you post a pic. of the cyl of that unit i have a few parts that are mixed up / i have the old one but not that pretty i will fix it for myself i guess ,, Cox .020 TD drive-plate issue Drive_10
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Post  getback Sun Apr 08, 2018 10:05 am

Yea Jason , i was trying to get this engine up and running with the new Alum. bakeplates from Greg and it want go into the CC But will go in an newer CC , That's special!? Cox .020 TD drive-plate issue _020_o10
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i haven't tried a new plastic tank BP. have you ?
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Post  Jason_WI Sun Apr 08, 2018 10:16 am

There is interference from the bottom of the cylinder that protrudes slightly into the crankcase. It’s variability in machining from Cox. I bet if you loosen the cylinder it fits right in.

Only way to fix is to remove a few thousands from the bottom of the cylinder.


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Post  1/2A Nut Sun Apr 08, 2018 7:23 pm

I had one out of 4 assembled that would catch a hair bit, it was a simple solution just back off the cylinder fit the backplate
on and then tighten the cylinder. I did not bother filing down anything the steel will bite the aluminum a hair and it's over.
Just remember to assemble with oil and enjoy the way the O ring snap locks the backplate into position.
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Post  getback Mon Apr 09, 2018 8:41 am

That fixed it , didn't even think to look in there , i guess it was all the trouble the engine was giving me to begin with pushed me in another direction lol! Thanks Guys and Greg he had PM'ed me so let me getback to him . tongue
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